Diethyl Ether → 627871-17-4

Temperatur

0 °C

To a suspension of 5-bromo-4-fluoro-2-methylaniline (11.2 g, 54.9 mmol) in concentrated HCl (35 mL) was added dropwise a solution of sodium nitrite (4.17 g, 60.4 mmol) in water (20 mL) over 30 minutes at 0° C. To the mixture was added dropwise a solution of SnCl2.2H2O (37.2 g, 165 mmol) in concentrated HCl (45 mL) over 1 hour. After stirring for 2 hours at 0° C., the reaction mixture was basified with 50% NaOH (50 mL). The mixture was further diluted with water (50 mL) and treated with another 50% NaOH (20 mL) and then crushed ice (200 g). The reaction mixture was extracted with ether (3×200 mL) and the combined organic phases were washed with brine, dried over Na2SO4, and filtered. The filtrate was acidified by adding an anhydrous solution of HCl in ether (2 N in ether, 42 mL, 82.5 mmol). The precipitate was collected and dried under reduced pressure to give 9.92 g (71%) of title compound as a pale yellow solid. 1H NMR (DMSO): 300 MHz δ 10.18 (bs, 3H), 7.98 (bs, 1H), 7.21 (m, 2H), 2.16 (s, 3H).

1. extractionThe reaction mixture was extracted with ether (3×200 mL)
2. washthe combined organic phases were washed with brine
3. dry with materialdried over Na2SO4
4. filtrationfiltered
5. customThe precipitate was collected
6. customdried under reduced pressure

ORD-Eintrag

ord-b7c4396dbaae48b1a05d35f4e2335c34

Quelldatensatz

uspto-grants-2005_11

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06964979B2